By William Schomberg and Muvija M LONDON (Reuters) -British finance minister Kwasi Kwarteng refused to say on Thursday if he would stick with his plan not to raise business taxes as media reported Prime Minister Liz Truss was rethinking an economic programme that plunged markets into turmoil. Truss’s plan, announced last month, has caused a rout in the government bond market, with some investors and Conservative Party lawmakers calling on her to reverse a plan for 43 billion pounds ($48 billion) of unfunded tax cuts, including a move to hold corporation tax at just 19%. “Our position hasn’t ch…